JP2001186265A - Interphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interphone device which makes the output level of a voice signal from an interphone master unit constant and enables a plurality of kinds of doorphone slave units whose specifications are different to output voice at proper volume. SOLUTION: This interphone device 1 is provided with the interphone master unit 2 and a doorphone slave unit 3 which inputs and amplifies a voice signal such as a back tone signal and a speech communication signal transmitted from the unit 2 and performs speech communication with the unit 2. The unit 2 transmits a voice amplification level control signal 5 which is preliminarily and separately set and with which the unit 3 amplifies the voice signal 4 just before transmitting the voice signal, and the unit 3 changes and controls the amplification factor of a voice amplifier circuit on the basis of the signal 5 to communicate with the unit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an intercom apparatus.

[0002]

2. Description of the Related Art Conventionally, as an intercom apparatus, as shown in FIG. 5 (a), a camera-equipped door phone slave unit C (hereinafter referred to as a door phone slave unit) which outputs a video signal taken by a television camera together with the audio signal. , A camera slave unit) and an intercom master unit D with a television (hereinafter, referred to as a TV master unit) corresponding to the intercom master unit, which inputs the video signal and displays an image photographed by the camera slave unit C. ) Is called a TV door phone system.

This intercom apparatus is connected and used by a two-wire cable 7 in order to simplify the connection between the camera slave unit C and the television master unit D.
Supplies power to the camera subunit C via the two-wire balanced cable as the two-wire cable 7. Further, a control signal is also multiplexed in multiplex transmission in which an audio signal and a video signal are superimposed on the power supply DC voltage of the power supply, and operation such as a telephone call between the television master unit D and the camera slave unit C is controlled.

An audio signal such as a call signal between the television base unit D and the camera slave unit C has a signal magnitude depending on its amplitude in the case of the baseband system, and a modulation degree in the case of the modulation system. Large and small controls are performed. That is, as shown in FIG. 4, the loudness of the sound output from the camera sub unit such as the alarm signal 4a, the back tone signal 4b, and the call signal 4c depends on the loudness of each audio signal transmitted from the TV base unit. Was determined by

[0005]

In the above-mentioned conventional technique, when each of the alarm signal 4a, the back tone signal 4b, and the call signal 4c is to be output from the camera slave C at an appropriate volume, It is necessary to change the size of the audio signal from the television master set D and output it.

[0006] By the way, the surrounding environment such as the gate of a house or the entrance where the camera slave C is installed varies widely. Therefore, for example, as shown in FIG. 5B, camera slave units C ′ having different specifications corresponding to the environmental conditions are prepared in advance, and the camera slave units C and C are selected by the user according to their preference. It is being considered to select and adopt one of the '. However, in that case, the camera slave C,
Due to the difference in the structure of C ', output from each camera slave unit at an appropriate volume does not occur. In addition, it is necessary to set the magnitude of the output of the audio signal from the television master set D so as to correspond to both of the camera slaves C and C '. The configuration of the audio circuit or the S / N characteristic (noise characteristic) Is not preferred in terms of

It is also conceivable that the setting of the conditions for amplifying the audio signals of the camera slave units C and C 'can be changed, and that the connection conditions and the like can be changed during construction. But,
In this case, you may accidentally forget to respond,
It is assumed that it is not optimal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make the output level of an audio signal from an intercom master unit constant, and to provide a plurality of types of door phone slave units having different specifications. An object of the present invention is to provide an intercom device capable of outputting sound at an appropriate volume.

[0009]

In order to achieve the above object, in an intercom apparatus according to the present invention, an intercom master unit and a voice signal such as a back tone signal and a call signal transmitted from the intercom master unit. And amplify the input, the intercom base unit having a door phone slave unit that performs a call with the intercom base unit,
Immediately before transmitting the audio signal, the intercom slave unit transmits an audio amplification level control signal that is individually set in advance and amplifies the audio signal, and the intercom slave unit receives the audio amplification level control signal based on the audio amplification level control signal. It controls the change of the amplification factor of the audio amplification circuit and talks with the intercom master unit.

[0010] Thus, immediately before the audio signal is transmitted from the intercom master unit to the intercom slave unit, a separately set audio amplification level control signal for amplifying the audio signal on the intercom slave unit side is provided. Sent out. The intercom slave unit performs change control of the amplification factor of the audio amplification circuit based on the audio amplification level control signal. Therefore,
Even if the output level of the audio signal from the intercom master unit is kept constant, a plurality of types of intercom slave units having different specifications can output a sound at an appropriate volume and talk.

The audio amplification level control signal is
A plurality of intercom master units, and a back tone signal of a voice signal, a type of a call signal, and the like can be identified, and the intercom slave unit can communicate with the plurality of intercom master units and a voice for each interphone master unit. It is preferable to have a control table for specifying the value of the amplification factor corresponding to the signal type, and to control the change of the amplification factor based on the control table. In this case, the intercom slave unit controls the change of the amplification factor of the audio amplification circuit in accordance with the plurality of intercom master units capable of talking and the audio signal type of each interphone master unit provided in the intercom slave unit. This is performed based on a control table that specifies the value of the amplification factor. Therefore, the amplification factor is surely changed without forgetting to mistakenly take the countermeasure, for example, when changing the connection condition or the like.

[0012] Further, the intercom slave unit is formed by a camera intercom slave unit which outputs a video signal photographed by a television camera together with the audio signal, and the intercom master unit receives the video signal and receives the video signal. The intercom master unit and the intercom master unit are connected by a two-wire cable, and the intercom master unit supplies power to the intercom slave unit. Preferably, it is supplied. In this case, a door phone slave unit formed by a camera door phone slave unit that outputs a video signal captured by a television camera together with an audio signal, and a video signal input and a video shot by the camera door phone slave unit are input. One of the plurality of intercom master units formed by the intercom master unit with a television to be projected is connected by a two-wire cable, and the intercom master unit is supplied with power to the intercom slave unit. Therefore, the degree of freedom in designing the intercom slave unit having a large number of component parts is improved, and for example, downsizing can be easily achieved.

[0013]

1 to 3 show an embodiment corresponding to all of claims 1 to 3 of the present invention, and FIG.
It is a schematic structure figure showing the intercom apparatus of one embodiment of the present invention. FIG. 2 is an explanatory diagram of the intercom apparatus. FIG. 3 is an explanatory diagram showing a sound amplification level control signal of the intercom apparatus.

The intercom apparatus 1 of this embodiment is
Intercom master 2 and intercom master 3 that receives and amplifies audio signal 4 such as back tone signal 4b and call signal 4c transmitted from intercom master 2, and performs a call with intercom master 2. Intercom device 1 including
The intercom master unit 2 sets the doorphone slave unit 3 individually set in advance immediately before transmitting the audio signal 4.
Sends an audio amplification level control signal 5 for amplifying the audio signal 4 (see FIG. 3), and the intercom slave unit 3 controls the change of the amplification factor of the audio amplification circuit 33 based on the audio amplification level control signal 5. And talk to the intercom master unit 2.

More specifically, in the intercom apparatus 1 of this embodiment, as shown in FIG. 2, the intercom slave unit 3 is a door intercom unit with a camera for outputting a video signal taken by a television camera together with the audio signal 4. (Hereinafter referred to as a camera slave unit) 3, and the intercom master unit 2 is provided with a television interphone for inputting the video signal and displaying an image photographed by the camera slave unit 3 on a monitor television 21. A main unit (hereinafter referred to as a main unit) 2 is formed, the main unit 2 and the camera unit 3 are connected by a two-wire cable 7, and the main unit 2 supplies power to the camera unit 3. Supplying. Therefore, the connection between the camera slave unit 3 and the TV master unit 2 can be simplified.

In addition to the monitor television 21, the television base unit 2 includes a speaker (not shown) and a microphone 22, an audio circuit 23 for amplifying and outputting a call signal output from the microphone 22, a back tone signal and an alarm. A tone generator 24 for generating a sound signal, a controller 25, and an interface (IF) 26 are provided. This TV base unit 2
It supplies power to the camera slave unit 3 to be described later through transmission and reception of audio signals and video signals via a two-wire cable 7 formed by a two-wire balanced cable. Operation control. In addition to this control, the control unit 25 outputs an audio amplification level control signal 5 generated by the camera slave unit 3 for amplifying the audio signal, and multiplexes the signal with the audio signal 4.

A camera slave 3, which will be described later, controls the change of the amplification factor of the audio amplification circuit based on the audio amplification level control signal 5. Note that the start and stop of the call operation are controlled by a power supply voltage value that superimposes an audio signal and a video signal on a power supply DC voltage when power is supplied via the two-wire cable 7. That is, the TV base unit 2
The power supply voltage from a power supply circuit (not shown) provided in the camera is controlled by the control unit 25, and the voltage switch provided in the control unit 36 of the camera slave unit 3 is operated by the control of the power supply voltage. It has become so. Note that, as shown in FIG.
It can be connected to two types of TV base units 2 (A, B).

The control section 25 is formed by a microcomputer. And besides controlling the power supply voltage,
Unique data specifying the model of the TV base unit 2 itself, which is individually set in advance and becomes an audio amplification level control signal 5 for the camera slave unit 3 to amplify the audio signal 4 written in the memory unit; As shown in FIG. 4, a code signal for identifying the type of the voice signal 4 of the alarm signal 4a, the back tone signal 4b, and the call signal 4c to be transmitted is generated. That is, the code signal is output to the interface unit 26 and is superimposed at a timing immediately before the audio signal 4 is transmitted. In the intercom apparatus 1, the audio amplification level control signal 5 is used to identify the two television masters 2 (A, B) and the type of the back tone signal 4b, the call signal 4c, and the like of the audio signal 4. I have.

In this case, the interface unit 26 superimposes the audio signal and the video signal on the power supply DC voltage to be supplied to the camera slave unit 3, and further superimposes the audio amplification level control signal 5 described above. Output to machine 3.
The interface unit 26 is provided with a call detection circuit that detects that a call button 31 of the camera slave unit 3 described below has been pressed, and outputs a detection signal to the microcomputer of the control unit 25. I have.

In the camera slave unit 3, a television camera and a video section (not shown) for outputting video signals photographed by the television camera, and an interface section (I
F) 32, an amplifier 33, a warning signal 4a, a back tone signal 4b, a speaker 34 for converting the voice signal 4 of the call signal 4c into an acoustic signal, and a microphone (not shown).
A call circuit (not shown) having a signal generation circuit for outputting a call signal when the call button 31 for calling the TV base unit 2 is pressed; a detection unit 35; and a control unit 36. . The camera slave unit 3 includes a control table 6 for specifying two TV master units 2 (A, B) that can communicate with the camera unit 3 and an amplification factor value corresponding to the type of the audio signal 4 for each TV master unit 2. It controls the change of the amplification factor based on the control table 6.

The interface unit 32 includes
The power supply DC voltage is superimposed with the audio signal 4, the video signal, and the audio amplification level control signal 5 output from the power supply circuit and multiplexed and transmitted so that the power supply DC voltage can be converted and used so as to be used as a power supply inside the camera slave unit 3. The video signal is extracted from the DC voltage for power supply, and the audio signal 4 is extracted to the video unit and output to the amplification unit 33. As shown in FIG. 3, the audio signal 4 includes, for example, the audio amplification level control signal 5 immediately before the call signal 4c, and is input to the detection unit 35 at the same time.

The amplifying unit 33 includes an alarm signal 4a, a back tone signal 4b, and a call signal 4c transmitted from the TV master set 2.
Is output from a speaker 34 as an audio signal. This audio amplification circuit 33
It is formed so that the amplification gain can be changed under the control of the control unit 36 described later.

The detection section 35 detects the audio signal 4 output from the interface section 32, extracts the audio amplification level control signal 5, and outputs it to the control section 36.

The control unit 36 is formed by a microcomputer. The control unit 36 has a voltage switch for stopping the operation of the video unit and the amplifying unit 33 during standby, and controls the amplifying unit 33 based on data written in the memory unit of the microcomputer. The communication operation is controlled by controlling the amplification factor of the amplifier circuit.

The voltage switch connects the interface section 32 to the video section and the amplifying section 33 in accordance with the terminal voltage of the two-wire cable 7 on the camera slave unit 3 side. Then, in the state where the camera slave unit 3 is in a standby state, that is, in a state of a predetermined standby voltage value fed from the TV master unit 2, the power is supplied from the TV master unit 2 which is in an open state and is in a talking state such as when the camera operates. The switch circuit is closed when the call operation voltage value is higher than the standby voltage, and the voltage switch stops the operation of the video unit and the amplification unit 33 of the camera slave unit 3 in the standby state. High current consumption can be suppressed.

In the memory of the microcomputer of the control unit 36, as shown in Table 1, for example, the model identification of A and B of the TV master unit 2 which can communicate with the camera slave unit 3, and each TV master unit 2 is provided with a control table for specifying amplification factor values corresponding to the alarm signal 4a, the back tone signal 4b, and the call signal 4c, which are the audio signal types for each of A and B.
Then, the unique data and the alarm signal 4a, the back tone signal 4b, and the call signal 4c transmitted from the television
The type of the audio signal 4 is identified by identifying the model of the TV base unit 2 and the type of the audio signal 4 from the code signal obtained by encoding the type of the audio signal 4.
To change the amplification factor.

[0027]

[Table 1]

The operation of the above TV intercom system is as follows.
When the visitor presses the call button 31 of the camera slave unit 3 shown in FIG. 2 and the microcomputer of the control unit 25 detects the call by the call detection circuit of the TV base unit 2, the camera that has called the camera is called. Video unit and amplification unit 3 of slave unit 3
3 is supplied with a power supply for operating the voltage value. Then, the terminal voltage between the lines on the camera slave unit 3 side where the call is made changes from the standby voltage to the call operation voltage. In the called camera slave unit 3, the voltage switch shifts from the open state to the closed state due to the rise of the terminal voltage, and the power is supplied to the video unit and the amplifying unit 33. Next, TV master unit 2
Transmits a notification sound such as a chime sound as a notification signal from the speaker of the TV base unit 2 to inform the room that the calling operation has been performed from the camera slave unit 3, and at the same time, the camera from which the calling is performed. Call button 3 on slave unit 3
A notification sound based on the sound signal 4 such as a chime sound based on the back tone signal 4b is output from the speaker 34 of the called camera slave unit 3 so that the visitor who has pressed down 1 can confirm the calling operation of the TV door phone system. Let it.

The above-described back tone notification is transmitted to the TV base unit 2
Immediately before transmitting the audio signal 4 to the camera slave unit 3 from the camera, the camera slave unit 3 includes an audio amplification level control signal 5 that is individually set in advance and amplifies the audio signal 4. The camera slave unit 3 controls the change of the amplification factor of the amplification unit 33 based on the audio amplification level control signal 5. That is, even if the output level of the audio signal 4 from the television base unit 2 is kept constant, the audio is output at an appropriate volume even in the camera slave unit 3 having different specifications, and the telephone conversation is performed.

At this time, the camera slave unit 3 controls the change of the amplification factor of the amplifying unit 33 by controlling the two TV master units 2 provided in the camera slave unit 3 capable of talking and the respective TV master units 2. Since the determination is performed based on the control table that specifies the value of the amplification factor corresponding to each of the audio signal types 4a, 4b, and 4c, there is no need to change the connection conditions and the like, for example.

Therefore, according to the above-described intercom apparatus, immediately before the audio signal is transmitted from the television master set 2 to the camera slave unit 3, the camera slave unit 3 amplifies the audio signal. Is sent out. The camera slave unit 3 controls the change of the amplification factor of the audio amplification circuit based on the audio amplification level control signal. Therefore, even when the output level of the audio signal from the TV base unit 2 is kept constant, a plurality of types of camera slave units 3 having different specifications output audio at an appropriate volume and can communicate.

The camera slave unit 3 is provided with control for changing the amplification factor of the audio amplifier circuit.
Since it is performed based on a control table that specifies a plurality of TV master units 2 that can talk and an amplification factor value corresponding to the type of audio signal for each TV master unit 2, for example, when changing connection conditions and the like, As described above, the amplification factor is surely changed without forgetting to take the countermeasure by mistake. In addition, a door phone slave unit 3 formed by a camera slave unit 3 that outputs a video signal captured by a TV camera together with an audio signal, and a television that inputs a video signal and displays an image shot by the camera slave unit 3 One of the two television masters 2 (A, B) formed by the master 2 is connected by a two-wire cable, and the television 2 supplies power to the camera slave 3. Camera slave unit 3 with a large number of component parts
In this case, the degree of freedom in design is improved, and for example, downsizing can be easily achieved.

[0033]

The present invention is embodied as in the above-mentioned embodiment. In the intercom apparatus according to the first aspect, immediately before transmitting an audio signal from the intercom master unit to the doorphone slave unit, A separately set audio amplification level control signal for amplifying the audio signal on the intercom slave unit side is transmitted, and the intercom slave unit determines the amplification factor of the audio amplification circuit based on the audio amplification level control signal. Since the change control is performed, even if the output level of the audio signal from the intercom master unit is kept constant, sound can be output from a plurality of types of doorphone slave units having different specifications at an appropriate volume and a conversation can be performed.

Further, in the intercom apparatus according to the second aspect, the amplification factor is reliably changed without forgetting to mistakenly take the countermeasure, for example, when changing the connection condition or the like.

Further, in the intercom apparatus according to the third aspect, a door phone slave unit formed of a camera-equipped door phone slave unit for outputting a video signal photographed by a television camera together with an audio signal, and a video signal are inputted. A two-wire cable is connected to one of the plurality of intercom master units formed by the intercom master unit with a television for displaying an image taken by the camera intercom slave unit, and Since the power is supplied to the intercom slave unit, the degree of freedom in design of the intercom slave unit having a large number of components is improved, and, for example, downsizing can be easily achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an intercom apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the intercom apparatus.

FIG. 3 is an explanatory diagram showing an audio amplification level control signal of the intercom apparatus.

FIG. 4 is an explanatory diagram of an audio signal.

FIG. 5 is an explanatory diagram showing an example of a conventional intercom apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intercom apparatus 2 Intercom master (TV master) 3 Door phone slave (camera slave) 33 Audio amplifier circuit 4 Audio signal 4b Back tone signal 4c Call signal 5 Audio amplification level control signal 6 Control table 7 Two-wire cable

Claims (3)

[Claims] 1. An intercom master unit, and a door phone slave unit that receives and amplifies a voice signal such as a back tone signal and a call signal transmitted from the interphone master unit and performs a call with the interphone master unit. An intercom apparatus, wherein the intercom master unit immediately transmits the audio signal,
The intercom slave unit sends a separately set audio amplification level control signal for amplifying the audio signal, and the intercom slave unit controls the change of the amplification factor of the audio amplification circuit based on the audio amplification level control signal. And an intercom base unit for communicating with the intercom base unit. 2. An audio amplification level control signal, comprising: a plurality of intercom master units; a back tone signal of an audio signal;
A control table in which the type of a call signal or the like is identifiable, and the intercom slave unit specifies a plurality of intercom master units capable of talking with the intercom master unit and an amplification factor value corresponding to a sound signal type of each intercom master unit. 2. The intercom apparatus according to claim 1, wherein the intercom apparatus has a function of changing the amplification factor based on the control table. 3. The intercom slave unit is formed by a camera-equipped intercom slave unit which outputs a video signal photographed by a television camera together with the audio signal, and the intercom master unit receives the video signal and receives the video signal. The intercom master unit and the intercom slave unit are connected by a two-wire cable while the intercom master unit and the intercom slave unit are formed by a television intercom master unit that projects images taken by the intercom slave unit.
The intercom apparatus according to claim 2, wherein the intercom master unit supplies power to the intercom slave unit.